1.   After receiving the altered cells, patients will be treated with methotrexate.

2.   In a progress report in December, the altered cells were said to be still flourishing, with no sign of cancerous growth.

3.   One month after receiving her genetically altered cells, her body was showing signs that the treatment was beginning to work.

4.   She was almost invisible and a little fearful of receiving the genetically altered cells.

5.   Slowly, the genetically altered cells will become the predominant population of cells in her bone marrow.

6.   That gene makes the altered cells resistant to the anticancer drug methotrexate.

7.   The altered cells are then inserted back into the body.

8.   The desired trans-gene is added to the soup of altered cells, which is zapped by a jolt of electricity.

9.   The hope was that the genetically altered cells would produce the missing blood factor and cure the children of their disease.

10.   Then scientists hit these altered cells with enough radiation to prevent them from replicating, but not enough to kill them.